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We analyze the application Video Review Navilens

Video review

What does it consist of:

April 2018

Navilens is a system to facilitate the mobility of people with reduced or no vision. The system consists of labels with color codes similar to barcodes or QR codes that are located at the points that you want to identify or where you want to place relevant information for the user.

These codes are read by an application that uses the camera of the mobile terminal. The information obtained from each tag is read by voice.

The advantage over other similar methods is that these codes can be read at distances much greater than those of traditional code systems.

Forms of Acquisition:

The manufacturer's website where you can find more information is:

You can download the free version of the android application by clicking on the following icon:

You can download the free version of the application for IOS by clicking on the following icon:

The use of the application to read labels has no cost for the end users. In case of being a company or entity, you can contact the company to find out a budget to label your space in the following email:


Technical verification:

We have tested the Navilens accessible label system in our facilities and we will tell you about the experience in the following lines.

The first step to be able to use the labels is to download the application in its Android or IOS version, which is easily found in both application stores and is free to download.

It is important to remember that for a better user experience it is recommended to activate the screen reader, although the application uses voice reading automatically, activating the screen reader facilitates interaction with the application.



Once all these steps have been carried out and without obstructing the rear camera of the phone, we proceed to read a series of labels that we have placed in our facilities that contain pre-loaded information specifically for each location.

The labels are identified by walking around the environment with the camera. The reading of the labels depends a lot on the camera of the mobile used, with a mid-range IPhone 6 or Samsung terminal the reading distance is effective enough to identify the labels in the environment, being an average of 4 meters, and having achieved readings at distances of up to 10 meters. However, this correct reading also depends to a great extent on the printing size of these labels.

As the camera identifies new labels in the environment, the application reports its position to better orient the camera and know its exact location (Right, left, center, very close ...). Once a tag has been identified, the application reads the information associated with that tag when we shake the phone. The information of each label can be modified by the company or entity in charge of the space through a web portal in real time with a cost associated with the service, although it is important to note that the reading application is free to download and has no associated cost for the end user.

The application is easy to use and in a short time we can become familiar with the main functionalities. It is possible to read the information on the labels in different languages ​​depending on the language in which we have configured our phone.



In terms of accessibility there is little to say, the application is correctly labeled and allows its full use with screen readers on both Android and IOS. In addition, the graphical menus present a high contrast for those users with partial vision who do not use the screen reader.

The quality of the information associated with each label depends on the time it takes the facility manager to update the content of each label so that they reflect the reality of the space and provide clear and concise information. In any case, as users of the application, we are not responsible for the management of this information and we can only read it.

In general, the reading of labels has been satisfactory in the tests, taking into account, as mentioned above, that the better the quality of the camera and the larger the size of the labels, the better results are achieved. The addressing indications have allowed us to focus the phone until we detect the centered location of each label, walking towards them until we receive the indication that we are close to it.



Battery consumption is high if the application is used continuously since it uses, among others, the processing, internet connection and camera functions. Consumption increases if the flash functionality is used, which allows the areas to be identified by the camera to be illuminated with the flash light if the environment does not have good lighting conditions.

There is one thing that it would be advisable to indicate more clearly, it is the indication of when we have the camera on and when not, for this it is important to make sure that the application is not running in the foreground and has been closed. Although in this aspect it is good to comment that the images of the camera are not shared externally, but that the image treatment is carried out internally in the terminal.



It is important to note that the application is capable of working without an internet connection as it has memory, as long as we use it to recognize labels that we had previously identified with connection.

In summary, the label system and its associated application facilitate the obtaining of information in different languages ​​to facilitate the guidance and identification of the environment for people with vision difficulties. The application is easy to use and as long as this system is widely spread


  • The innovation of a system that allows reading codes at a greater distance than other systems and orienting the phone to guide itself through them
  • The great usability and accessibility of the application
  • The free cost to the end user

Improvement points

  • The fact of depending on the manager of the facilities and having a cost for this, means that the system for the moment is not implemented in many spaces
  • The fact that the application does not have a list of facilities identified with these tags in which to use the app
  • Battery consumption is high with continuous use
  • Design and manufacturing: 4 5 on.
    This section refers to the physical aspects and details of the manufacturing of the technological product.
  • User experience: 4 5 on.
    This criterion is linked to the user's assessment when relating to the technical product or application.
  • Technical benefits: 4 5 on.
    Description of the quality of the technical specifications of the technological solution.
  • Accessibility: 5 5 on.
    It is the degree to which people can use or access a product, technological solution or service, regardless of their technical, cognitive or physical abilities.

Social valuation:

We have evaluated the reading of codes with the Navilens application with our volunteer Andrés, who specializes in evaluating products for users with reduced and null vision.

In general, Andrés' impressions are very positive considering the label reading system an innovative and useful way to facilitate more than automatic guidance, obtaining important information to move autonomously through certain spaces.

Learning to use the application has taken almost no time and interaction with the IOS screen reader has facilitated easy use.

Andrés focuses on information and the way it is received. For him it is very positive that the managers of the spaces can modify the information in real time to reflect the changes in the environment with relative agility.

Regarding the content, he emphasizes that we cannot go overboard with the amount of information that is entered on each label in the case of labels intended for guidance. It has to be important information but not overwhelm the listener.

In the case of explanatory labels for exhibition areas, we can include more extensive information without it saturating us so much.

In our case, more general labels that give information about everything that we are going to find in an area have been more useful than labels that are too specific in every little detail. For Andrés, it is very important to reference the information with location data of the type (first door on the left, second exit on the right, from the front)

Care must be taken with commas and periods when entering the information for each tag because it causes pauses when the screen reader gives us the information.

The detection distance with the camera of an Iphone 6 terminal is good, especially with large-sized labels. The idea behind what was observed in the tests is to try to place them at a height of approximately 1,5 to 2 meters from the ground.

Battery consumption during tests was high without using the flash.



  • Impact and utility: 4 5 on.
    It describes to what extent the functionalities of the product are useful and impact on improving the life of the user.
  • Usability and accessibility: 5 5 on.
    Possibility of the device to be used, understood and taken advantage of under equal conditions for anyone.
  • Design and ergonomics: 4 5 on.
    Assessment of how the design of the technological solution adapts to the person to achieve greater comfort and efficiency when using it.
  • Ease of Acquisition: 3 5 on.
    It refers to the possibilities of accessing and acquiring a technological solution by the end user.

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